Buggy code:
case ( ( int ) ( CompilerOptions . MaskedCatchBlock ) ) : case ( ( int ) ( CompilerOptions . NoImplicitStringConversion ) ) : case ( ( int ) ( CompilerOptions . NoEffectAssignment ) ) : case ( ( int ) ( CompilerOptions . AccidentalBooleanAssign ) ) : case ( ( int ) ( CompilerOptions . EmptyStatement ) ) : case ( ( int ) ( CompilerOptions . FinallyBlockNotCompleting ) ) : return CategorizedProblem . CAT_POTENTIAL_PROGRAMMING_PROBLEM ; case ( ( int ) ( CompilerOptions . OverriddenPackageDefaultMethod ) ) : case ( ( int ) ( CompilerOptions . IncompatibleNonInheritedInterfaceMethod ) ) : case ( ( int ) ( CompilerOptions . LocalVariableHiding ) ) : case ( ( int ) ( CompilerOptions . FieldHiding ) ) : return CategorizedProblem . CAT_NAME_SHADOWING_CONFLICT ; case ( ( int ) ( CompilerOptions . UnusedLocalVariable ) ) : case ( ( int ) ( CompilerOptions . UnusedArgument ) ) : case ( ( int ) ( CompilerOptions . UnusedImport ) ) : case ( ( int ) ( CompilerOptions . UnusedPrivateMember ) ) : case ( ( int ) ( CompilerOptions . UnusedDeclaredThrownException ) ) : case ( ( int ) ( CompilerOptions . UnnecessaryTypeCheck ) ) : case ( ( int ) ( CompilerOptions . UnnecessaryElse ) ) : return CategorizedProblem . CAT_UNNECESSARY_CODE ; case ( ( int ) ( CompilerOptions . UsingDeprecatedAPI ) ) : return CategorizedProblem . CAT_DEPRECATION ; case ( ( int ) ( CompilerOptions . NonExternalizedString ) ) : return CategorizedProblem . CAT_NLS ; case ( ( int ) ( CompilerOptions . Task ) ) : return CategorizedProblem . CAT_UNSPECIFIED ; case ( ( int ) ( CompilerOptions . MissingJavadocComments ) ) : case ( ( int ) ( CompilerOptions . MissingJavadocTags ) ) : case ( ( int ) ( CompilerOptions . InvalidJavadoc ) ) : return CategorizedProblem . CAT_JAVADOC ; case ( ( int ) ( CompilerOptions . UncheckedTypeOperation ) ) : return CategorizedProblem . CAT_UNCHECKED_RAW ; default : break categorizeOnIrritant ; } } else { irritantInt = ( ( int ) ( irritant > > > 32 ) ) ; switch ( irritantInt ) { case ( ( int ) ( ( CompilerOptions . EnumUsedAsAnIdentifier ) > > > 32 ) ) : case ( ( int ) ( ( CompilerOptions . AnnotationSuperInterface ) > > > 32 ) ) : case ( ( int ) ( ( CompilerOptions . AutoBoxing ) > > > 32 ) ) : case ( ( int ) ( ( CompilerOptions . MissingOverrideAnnotation ) > > > 32 ) ) : case ( ( int ) ( ( CompilerOptions . MissingDeprecatedAnnotation ) > > > 32 ) ) : return CategorizedProblem . CAT_CODE_STYLE ; case ( ( int ) ( ( CompilerOptions . MissingSerialVersion ) > > > 32 ) ) : case ( ( int ) ( ( CompilerOptions . VarargsArgumentNeedCast ) > > > 32 ) ) : case ( ( int ) ( ( CompilerOptions . NullReference ) > > > 32 ) ) : case ( ( int ) ( ( IncompleteEnumSwitch ) > > > 32 ) ) : return CategorizedProblem . CAT_POTENTIAL_PROGRAMMING_PROBLEM ; case ( ( int ) ( ( TypeParameterHiding ) > > > 32 ) ) : return CategorizedProblem . CAT_NAME_SHADOWING_CONFLICT ; case ( ( int ) ( ( CompilerOptions . UnhandledWarningToken ) > > > 32 ) ) : return CategorizedProblem . CAT_UNNECESSARY_CODE ; case ( ( int ) ( ( CompilerOptions . ForbiddenReference ) > > > 32 ) ) : case ( ( int ) ( ( CompilerOptions . DiscouragedReference ) > > > 32 ) ) : return CategorizedProblem . CAT_RESTRICTION ; case ( ( int ) ( ( CompilerOptions . RawTypeReference ) > > > 32 ) ) : return CategorizedProblem . CAT_UNCHECKED_RAW ; default : break categorizeOnIrritant ; } } } switch ( problemID ) { case IProblem . IsClassPathCorrect : case IProblem . CorruptedSignature : return CategorizedProblem . CAT_BUILDPATH ; default : if ( ( problemID & ( IProblem . Syntax ) ) != 0 ) return CategorizedProblem . CAT_SYNTAX ; if ( ( problemID & ( IProblem . ImportRelated ) ) != 0 ) return CategorizedProblem . CAT_IMPORT ; if ( ( problemID & ( IProblem . TypeRelated ) ) != 0 ) return CategorizedProblem . CAT_TYPE ; if ( ( problemID & ( ( ( IProblem . FieldRelated ) | ( IProblem . MethodRelated ) ) | ( IProblem . ConstructorRelated ) ) ) != 0 ) return CategorizedProblem . CAT_MEMBER ; } <START_BUG> return CategorizedProblem . CAT_UNSPECIFIED ; <END_BUG> } private void handle ( int problemId , String [ ] problemArguments , String [ ] messageArguments , int problemStartPosition , int problemEndPosition ) { } private void handle ( int problemId , String [ ] problemArguments , String [ ] messageArguments , int problemStartPosition , int problemEndPosition , CompilationResult unitResult ) { } private void handle ( int problemId , String [ ] problemArguments , String [ ] messageArguments , int severity , int problemStartPosition , int problemEndPosition ) { } public void hiddenCatchBlock ( ReferenceBinding exceptionType , ASTNode location ) { } public void hidingEnclosingType ( TypeDeclaration typeDecl ) { } public void hierarchyCircularity ( SourceTypeBinding sourceType , ReferenceBinding superType , TypeReference reference ) { } public void hierarchyHasProblems ( SourceTypeBinding type ) { } public void illegalAbstractModifierCombinationForMethod ( ReferenceBinding type , AbstractMethodDeclaration methodDecl ) { } public void illegalClassLiteralForTypeVariable ( TypeVariableBinding variable , ASTNode location ) { } public void illegalExtendedDimensions ( AnnotationMethodDeclaration annotationTypeMemberDeclaration ) { } public void illegalExtendedDimensions ( Argument argument ) { } public void illegalGenericArray ( TypeBinding leadtComponentType , ASTNode location ) { } public void illegalInstanceOfGenericType ( TypeBinding checkedType , ASTNode location ) { }

Fix:
return CategorizedProblem . CAT_INTERNAL ;